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VCR and TV-tuners

VCR and TV-tuners

Spectrum Analyzer is intended for visual inspection of the spectrum of an investigated signal on the oscilloscope screen. The signal can be continuous or pulsed.
Block diagram

Before we are going to look what it is inside those magic shining boxes called tuner, I will explain the blockdiagram. The picture at the right is a “simple” blockdiagram.

Klick on the image to get a larger picture.

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Now, let’s open the tuner and try to identify the different parts inside. The tuner I have is a SHARP-modell. This tuner is a 3-band tuner wich covers the frequency 40MHz – 900Mhz. The IF output is at 38.9 MHz European Standard.

Klick on the image to get a larger picture.

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The photo at the right shows the component side of the tuner. Some components are idetified as mixer, varactor-diods etc. Klick on the image to get a larger picture.

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